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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Stock Options Activity

 

 

 

Number of

Options and

Unvested

Shares

 

 

Weighted

Average

Exercise Price

 

 

Weighted

average

remaining

contractual

life (years)

 

 

Aggregate

intrinsic

value

 

Balance at December 31, 2018

 

 

1,885,504

 

 

 

1.57

 

 

 

9.07

 

 

$

1,252,496

 

Options granted

 

 

617,637

 

 

 

9.33

 

 

 

9.69

 

 

 

 

 

Options exercised

 

 

(166,015

)

 

 

0.41

 

 

 

 

 

 

 

 

 

Options cancelled

 

 

(66,180

)

 

 

2.23

 

 

 

 

 

 

 

 

 

Balance at June 30, 2019

 

 

2,270,946

 

 

 

3.74

 

 

 

9.20

 

 

 

81,680,409

 

Options vested and expected to vest as of

   June 30, 2019

 

 

2,270,946

 

 

 

3.74

 

 

 

9.20

 

 

 

81,680,409

 

Options exercisable as of June 30, 2019

 

 

446,367

 

 

 

1.06

 

 

 

7.99

 

 

$

18,500,177